Hello, sorry about thiese eruptions. They could be due to virus or bacterial infection. Please send picture of the rash. Strepto infection can also give such rash.
It is called Scarlet fever.
You could wait few days for rash to subside but consult pediatrician if fever returns.
I have attached a picture. Apparently Scarlet fever is quite rare. I haven't seen this type of rash on internet.
Please let me know what do you think about attached picture